If you are male and between the ages of 18-25 at the time of your arrival in the U.S., you must complete the initial Selective Service Registration. However, if you have a son, it is his responsibility to register for Selective Service when he turns 18. It is also important to update your address with Selective Service whenever you move, up until the age of 25. For instructions on how to completed your selective service form, please read the guide below: